en Health Health Original Research Original Research <p> <strong> Background </strong>:Hypertension is an important public-health challenge worldwide. The prevalence of hypertension greatly varies across countries. The aim of this study was to estimate the prevalence of self-reported hypertension and to determine related factors in a large random sample of Tehran population in 2011. </p><p> <strong> Methods </strong>: In this cross sectional study, 69173 individuals aged 25–64 years were selected using multistage cluster random sampling method. All participants were interviewed by trained personnel using standard questionnaires. Weighted prevalence and incidence rates were calculated and principle component analysis (PCA) was used to construct wealth index. Chi-square and odds ratio were used to assess associations in univariate analysis. Logistic Regression model was used in multivariate analysis. </p><p> <strong> Results </strong>: The prevalence of self-reported hypertension was 5.27% in total, 3.83% in men and 6.64% in women (p< 0.001). The annual incidence rate of self-reported hypertension was 6.87 per 1000 5.26 in men and 8.43 in women (p< 0.001), obviously varied across various districts. In multivariate analysis, age, sex (woman), marital status (single), obesity and smoking were positively associated with prevalence of self-reported hypertension. Education level was negatively associated to hypertension. On the other hand, wealth status was not associated to self-reported hypertension. </p><p> <strong> Conclusion </strong>: Our study findings highlighted low awareness rates of hypertension among Tehran adults especially in men and younger people. Hence, we recommend public health strategies to improve health education programs. Moreover, programs to develop the surveillance system and screening programs to early detection of undiagnosed cases are urgently needed particularly in high risk population subgroups. </p><p>  </p> Hypertension, Self-reporting, Prevalence, Tehran. 677 684 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-1-736&slc_lang=en&sid=1 Bahman Cheraghian cheraghian2000@yahoo.com 200319475328460013423 200319475328460013423 No Department of Epidemiology, School of Public Health, Iran University of Medical Sciences, Tehran&Instructor, Department of Epidemiology and Biostatistics, School of Public Health, Ahwaz Jundishapur University of Medical Sciences, Mohsen Asadi-Lari Mohsen.asadi@yahoo.com 200319475328460013424 200319475328460013424 Yes Department of Epidemiology, School of Public Health, Iran University of Medical Sciences, Tehran, Iran. Mohammad Ali Mansournia Mansournia_ma@yahoo.com 200319475328460013425 200319475328460013425 No Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran. Reza Majdzadeh rezamajd@tums.ac.ir 200319475328460013426 200319475328460013426 No Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran. Kazem Mohammad mohamadk@tums.ac.ir 200319475328460013427 200319475328460013427 No Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran. Saharnaz Nedjat nejatsan@tums.ac.ir 200319475328460013428 200319475328460013428 No Department of Epidemiology and Biostatistics, School of Public Health, Knowledge Utilization Mohammad Reza Vaez-Mahdavi vaezmahdavi@shahed.ac.ir 200319475328460013429 200319475328460013429 No Department of Physiology, Shahed University, Tehran, Iran. Soghrat Faghihzadeh faghihz@modares.ac.ir 200319475328460013430 200319475328460013430 No Department of Social Medicine, Faculty of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran.